| Normal | Else
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| Highest level of dome of diaphragm > 1.5 cm above line b/n costophrenic & vertebrophrenic junctions
| Empysema
| Paratracheal stripe < 10 mm
| CHF, lymphoma, bronchogenic cyst
| Main PA < 3 cm
| Indicative of PA hypertension
| Aorta: | Root < 3.6 cm Ascending < 3.5 cm Proximal descending < 2.6 cm Distal descending < 2.4 cm Abd < 3 cm Aneurysm |
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PA
Major fissure visible → ipsilateral lower lobe atelectasis
H/o breast Ca → look for internal mammary LAD; vertebral metastases
H/o lymphoma → look for donut sign on lateral CXR
Cavity wall:
< 5 mm → infection
> 10 mm → SCC
Autoimmune Diseases
| I | asthma |
| I & II | allergic bronchopulmonary aspergillosis |
| II | Goodpasture's Sx |
| III & IV | hypersensitivity pneumonitis |